Epoch-Synchronous Overlap-Add (ESOLA)

Fast C++ implementation of ESOLA using KFRLib, can be used for online time-stretch augmentation during SpeechToText training.

C++ Rewrite

Mostly an C++ re-write of https://github.com/BaronVladziu/ESOLA-Implementation to be used in Online SpeechToText training.

Build

    git clone https://github.com/viig99/esolafast.git
    cd esolafast
    git submodule update --init --recursive
    mkdir build && cd build
    cmake ..
    make -j`nproc`

Run

    ./esolafast -i INPUT_PATH -o OUTPUT_PATH -t 1.5
    ./esolafast --help

Performance

Right now faster than sox, sound-stretch & rubberband, CPU usage is much higher. Quality is better than rubberband, same as sox & sound-stretch.

$ time sox sample_file.wav sox_1_5.wav tempo 1.5
sox sox_1_5.wav tempo 2.0  0.01s user 0.01s system 17% cpu 0.022 total

$ time soundstretch sample_file.wav st_1_5.wav -tempo=1.5
soundstretch st_1_5.wav -tempo=1.5  0.01s user 0.00s system 44% cpu 0.022 total

$ time esolafast -i sample_file.wav -o es_1_5.wav -t 1.5
esolafast -i  -o  -t 1.5  0.01s user 0.00s system 92% cpu 0.010 total

$ time rubberband -q -T 1.5 sample_file.wav rb_1_5.wav
rubberband -q -T 1.5  rb_1_5.wav  0.01s user 0.00s system 89% cpu 0.022 total

Python Bindings

Generate the python bindings, using pybind11

 $ python setup.py build

For example using the python binding check examples/test.py

References

• Epoch-Synchronous Overlap-Add (ESOLA) for Time- and Pitch-Scale Modification of Speech Signals
• Epoch Extraction From Speech Signals